Fans can rejoice!! On social media, it was announced that the anime Mairimashita! Iruma-kun ( Welcome to Demon School, Iruma-kun ) will be getting a 4th season.
Therefore, no release date has yet been revealed. Additionally, fans can check out a new promotional image.

Iruma-kun Synopsis
Iruma Suzuki, a 14-year-old human boy, is sold to a demon by his parents. The demon, known as Sullivan, takes Iruma to the Demon World and officially adopts him as his grandson. He enrolls Iruma in Babyls School for Demons, where his position is that of headmaster, and where Iruma quickly befriends the demons Alice Asmodeus and Clara Valac. However, Sullivan tells Iruma never to reveal that he is human, as he will be eaten if discovered. Iruma then vows to blend in during his time in the demon world, though he stands out because of all the situations and adventures that arise.
The first season premiered in October 2019 on NHK Educational and had 23 episodes. Crunchyroll streamed the anime as it aired in Japan under the English title Welcome to Demon School, Iruma-kun .
Finally, Osamu Nishi launched the manga in Weekly Shonen Champion in March 2017, and it currently has 23 volumes. Furthermore, as of January 2020, the first 15 volumes of the manga had over 2.5 million copies in circulation.
Source: Official Website
